PDF malware analysis — malicious · 03bc68698784c69c

MALICIOUS

PDF

32.0 KB Created: 2010-01-31 15:27:43 +03:00 Authoring application: repeatTendLatin (via aa40d567c94a14b2e9c126c1b043457d)

MD5: 31277c93c6807ef24cdca6c6748897d3 SHA-1: e60bca8c871c04384cfc4dccce704afb7e40d703 SHA-256: 03bc68698784c69c42db97d364e5d2f89dd51e05bdf031cd9725005263306ab4

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes eval() and string manipulation, indicating an attempt to obfuscate malicious code. This script is designed to download and execute a secondary payload, as suggested by the PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics. The presence of JavaScript actions and filters like ASCII85Decode further supports the exploitation of PDF vulnerabilities for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `b107f93ce8ca2e74fc394c0175f0c9ee553780d24e0c31d5ad6336648c84c589`	pdf-javascript-stream	PDF /JS object 12 at offset 0x167C	35365 bytes
`javascript_obj0014_001.js` `07377d365e9af2f9fadc425a26e9ca8d78c29716b8cbdb8a99a5fb28fe33ebf2`	pdf-javascript-stream	PDF /JS object 14 at offset 0x7397	2058 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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